/*
fuzzylite (R), a fuzzy logic control library in C++.

Copyright (C) 2010-2024 FuzzyLite Limited. All rights reserved.
Author: Juan Rada-Vilela, PhD <jcrada@fuzzylite.com>.

This file is part of fuzzylite.

fuzzylite is free software: you can redistribute it and/or modify it under
the terms of the FuzzyLite License included with the software.

You should have received a copy of the FuzzyLite License along with
fuzzylite. If not, see <https://github.com/fuzzylite/fuzzylite/>.

fuzzylite is a registered trademark of FuzzyLite Limited.
*/

#include "fuzzylite/rule/Expression.h"

#include "fuzzylite/hedge/Hedge.h"
#include "fuzzylite/rule/Rule.h"
#include "fuzzylite/term/Term.h"
#include "fuzzylite/variable/Variable.h"

namespace fuzzylite {

    Expression::Expression() {}

    Expression::~Expression() {}

    Proposition::Proposition() : Expression(), variable(fl::null), term(fl::null) {}

    Proposition::~Proposition() {
        for (std::size_t i = 0; i < hedges.size(); ++i)
            delete hedges.at(i);
        hedges.clear();
    }

    Expression::Type Proposition::type() const {
        return Expression::Proposition;
    }

    std::string Proposition::toString() const {
        std::ostringstream ss;
        if (variable)
            ss << variable->getName();
        else
            ss << "?";
        if (not hedges.empty()) {
            ss << " " << Rule::isKeyword() << " ";
            for (std::size_t i = 0; i < hedges.size(); ++i)
                ss << hedges.at(i)->name() << " ";
        }

        if (term) {  // term is fl::null if hedge is any
            if (hedges.empty())
                ss << " " << Rule::isKeyword() << " ";
            ss << term->getName();
        }
        return ss.str();
    }

    Operator::Operator() : Expression(), name(""), left(fl::null), right(fl::null) {}

    Operator::~Operator() {
        if (left)
            delete left;
        if (right)
            delete right;
    }

    Expression::Type Operator::type() const {
        return Expression::Operator;
    }

    std::string Operator::toString() const {
        return name;
    }

}
